Your company is considering a new investment project. The investment cost is expected to be $$22$ million and will return $$8\mathrm{.}1$ million for $5$ years in net cash flows. The ratio of debt to equity $($D$/$E$)$ is $2$ to $1.$ The cost of equity is $15\%,$ the pretax cost of debt is $7\mathrm{.}5\%,$ and the tax rate is $25\%.$ Assuming average risk, what is the appropriate discount rate $($WACC$)?($Hint: for ease of calculation, you can assign dollar values to debt and equity so that the D$/$E ratio $=2).$

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